Sang-Chul Ko, Seoul KR

Sang-Chul Ko, Seoul KR

Patent application number

Description

Published

20090087000

Array speaker system and method of implementing the same - Provided are an array speaker system and a method of implementing the same. The array speaker system includes a group setting unit setting one or more combinations of a plurality of speakers included in an array speaker system into at least one group according to a predetermined adjustment factor, a signal assignment unit dividing an input signal into at least one sound source signal according to the adjustment factor and selectively assigning the divided sound source signal(s) to the set group(s), a sound adjustment unit adjusting a sound source signal to be output through speakers within the group according to sound source characteristics of the group, and a signal output unit outputting the adjusted sound source signal through the speakers within the group. Using the array speaker system, sound adjustment and sound output optimized for each frequency band can be obtained during output of a sound source signal having a broad range of frequencies, and a near-field effect that distorts an output sound source signal can be prevented. Moreover, stereo and multi-channel effects can be obtained and the directivity of the array speaker system can be improved.

04-02-2009

20090136045

Method and apparatus for outputting sound source signal by using virtual speaker - A method and apparatus for outputting a sound source signal by using a virtual speaker are provided. The method includes generating a virtual sound source signal delayed by a virtual delay value, instead of by the minimum delay value, according to a sampling rate of an input sound source signal, from the input sound source signal; generating a speaker output signal in which a sampling rate is changed based on the input sound source signal and the generated virtual sound source signal; and outputting the generated speaker output signal. Thus, a non-uniform radiation pattern, which causes distortion in a sound radiated from a speaker array, is removed and the limitation of a frequency band of a controllable sound source signal is overcome, thereby providing a stable sound.

05-28-2009

20090141915

Method and apparatus for focusing sound using array speaker - Provided is a method and apparatus for focusing sound using an array speaker system. The method includes generating a plurality of delayed signals to be focused to a predetermined position from an input signal, filtering a low-frequency signal having a frequency that is lower than a reference frequency from the delayed signals, generating low-frequency focusing signals divided into 2 groups by adjusting a gain of the filtered low-frequency signal, and applying the low-frequency focusing signals divided into the 2 groups to speaker units of the array speaker system at both sides with respect to a center portion of the array speaker system and outputting the low-frequency focusing signals through the speaker units. In this way, the performance of sound focusing for the low-frequency signal can be improved and thus a listener located a predetermined distance from and in a predetermined direction relative to the array speaker system can clearly listen to the low-frequency focusing signals.

06-04-2009

20090154723

Method of and apparatus for controlling sound field through array speaker - Provided are a method and apparatus for controlling a sound field through an array speaker. The method includes calculating a coefficient of a filter that controls sound pressure of an input signal, based on a sound pressure ratio of a suppression area that suppresses sound emitted from an array speaker and an emphasis area that emphasizes the sound, and sound pressure efficiency in the emphasis area, generating a plurality of output signals that focuses the sound to the emphasis area by filtering the input signal based on the calculated coefficient of the filter, and outputting a sound field controlled sound based on the generated plurality of output signals. Accordingly, a listener in a predetermined direction and distance from the array speaker can clearly hear sound, without wearing an earphone or a headset so as to focus the sound only to the listener.

06-18-2009

20100061571

DIRECTIONAL SOUND GENERATING APPARATUS AND DIRECTIONAL SPEAKER ARRAY INCLUDING THE SAME - A directional sound generating apparatus and a directional speaker array including the same are disclosed. The directional sound generating apparatus includes a sound transducer, a reflection plate which is located behind the sound transducer, and a blocking plate which is provided between a front portion and a back portion of the sound transducer.

03-11-2010

20100123519

APPARATUS AND METHOD FOR CONTROLLING DISTORTIONS OF AMPLIFIER - Disclosed are an apparatus and method for controlling output distortions of an amplifier. The apparatus for controlling output distortions of an amplifier, includes a compensation signal generator to predict a fluctuation of a supply voltage of a power supply using a prediction model which reflects fluctuations characteristics of the supply voltage, and to generate a compensation signal based on the prediction, and a compensator to transform an input signal using the compensating signal to control the output distortions.

05-20-2010

20100142733

Apparatus and Method for Generating Directional Sound - An apparatus and method for generating directional sound are provided to output sound towards a specific sound zone. The apparatus includes an internal loudspeaker array having at least one sound source and edge loudspeakers, each with a sound source having directivity, located at respective ends of the internal loudspeaker array.

06-10-2010

20100150361

APPARATUS AND METHOD OF PROCESSING SOUND - A technology for controlling acoustic energy distribution in a control region is provided. A sound processing apparatus includes a control filter such that a controllable sound zone is formed in the control region, and the sound processing apparatus synthesizes the control filter and an input signal to transfer sound to a desired location or a specific user. The numbers, the size and the locating positions of the sound zone and/or the control region may be controlled.

06-17-2010

20100156529

APPARATUS AND METHOD FOR ESTIMATING POWER FOR AMPLIFIER - Described herein is an apparatus and method for estimating the amount of power that is to be consumed by an amplifier. An estimation section may be determined based on frame data of an input signal that is to be input to the amplifier. The estimation section may be stored to in a predetermined section, and the amount of power to be consumed by the amplifier may be estimated in advance based on the stored signal. The predetermined section may be determined in consideration of response a characteristic of a power supply of the amplifier. The amount of power may be calculated by assigning weight to the stored signal.

06-24-2010

20100157740

APPARATUS AND METHOD FOR CONTROLLING ACOUSTIC RADIATION PATTERN OUTPUT THROUGH ARRAY OF SPEAKERS - Provided are an apparatus and method for controlling an acoustic radiation pattern output through an array of speakers. The apparatus stores a plurality of filter values for forming a plurality of corresponding control patterns set in advance from an input signal. The apparatus forms a compensation control pattern such that signals output through the array of speakers have an intended pattern in consideration of a filter value of a focusing filter. The apparatus selects at least one of the control patterns set in advance to form the compensation control pattern, and processes the input signal using a filter value corresponding to the selected control pattern.

06-24-2010

20100296660

APPARATUS AND METHOD FOR SOUND FOCUSING - A sound focusing technique is provided to transfer sound to a particular direction. In a sound focusing apparatus, first and second speakers may be arranged to emit sound in opposite directions to form a sound zone. An amplitude and/or a phase of a received signal may be adjusted by a signal processing unit to assign the received signal and the adjusted signal to the first and second speakers, respectively.

11-25-2010

20110058677

APPARATUS AND METHOD FOR GENERATING DIRECTIONAL SOUND - An apparatus for generating directional sound is provided. By using a time-variant beam pattern, the apparatus may generate constant direct waves in a listening area and may vary reflected waves followed by the direct waves according to time. The apparatus may convolute the time-variant beam pattern with a sound signal, may process an acoustic signal, which may be obtained through convolution, into a multi-channel signal, and may amplify and output the multi-channel signal.

03-10-2011

20110091042

APPARATUS AND METHOD FOR GENERATING AN ACOUSTIC RADIATION PATTERN - Disclosed are an apparatus and method for creating an acoustic radiation pattern, which may improve sound focusing performance to a target position. The acoustic radiation pattern creating apparatus may process an input signal which may be output through a speaker array in a room such that at least one vertical-directional reflected wave component of the input signal may overlap a direct sound of the input signal at the target position. Then, the acoustic radiation pattern creating apparatus may replicate the processed input signal by the number of output channels of the speaker array, and may process the replicated input signals such that the replicated input signals may form a predetermined radiation pattern in a horizontal direction in the room when the replicated input signals are output through the speaker array.

04-21-2011

20110135115

SOUND ENHANCEMENT APPARATUS AND METHOD - A sound enhancement apparatus and method which produce low IMD over a broadband frequency region and performs BSE to offer a sound which is natural to the human ears, are provided. The sound enhancement apparatus includes a preprocessor, a BSE signal generator, and a gain controller. The preprocessor divides a source signal into a high-frequency signal and a low-frequency signal and analyzes the low-frequency signal to obtain prediction information regarding a degree of distortion that will be generated by the low-frequency signal. The BSE signal generator generates a higher harmonic signal for the low-frequency signal as a BSE signal to be substituted for the low-frequency signal, wherein the order of the higher harmonic signal is adjusted based on the prediction information regarding the degree of distortion. The gain controller adjusts a synthesis ratio of the low-frequency signal and the BSE signal adaptively depending on the prediction information regarding the degree of distortion.

06-09-2011

20120014525

Method and apparatus for simultaneously controlling near sound field and far sound field - An apparatus and method for forming a Personal Sound Zone (PSZ) at a location of a listener are provided. An apparatus for simultaneously controlling a near sound field and a far sound field may classify the near sound field and the far sound field based on a distance between an array speaker and a listener, and may control the near sound field and the far sound field and thus, it is possible to perform focusing even when the listener is located in adjacent to the array speaker. Additionally, the apparatus may generate a directive sound source using the array speaker, and at the same time, may reduce a sound pressure in a far field, thereby reducing a sound source spreading to the far field while focusing is performed at the location of the listener.

01-19-2012

20120057732

METHOD AND APPARATUS OF ADJUSTING DISTRIBUTION OF SPATIAL SOUND ENERGY - Provided is a method of adjusting a distribution of spatial sound energy, including storing information associated with a sound transfer function from each of speakers of a speaker array to a position of at least one listener, and information associated with the sound transfer function from each of the speakers of the speaker array to a far-field position, and generating at least two sound beams maximizing a far-field sound pressure attenuation with respect to a source signal, based on information associated with the sound transfer function, in order to form a personal sound zone in the position of the at least one listener.

03-08-2012

20120163636

Method and apparatus for creating personal sound zone - An apparatus and method for creating a personal sound zone are provided. The personal sound zone creating apparatus increases directivity in a horizontal direction by including a broadside array adapted to generate a sound beam perpendicularly to an arrangement of an array constituted by at least three transducers in a personal audio device. Also, the personal sound zone creating apparatus controls back radiation by including an end-fire array by arranging at least two arrays.

06-28-2012

20120170762

METHOD AND APPARATUS FOR CONTROLLING DISTRIBUTION OF SPATIAL SOUND ENERGY - A spatial sound energy (SSE) distribution control apparatus calculates filter coefficients for controlling distribution of the sound energy of an input signal, in consideration of a sound energy ratio between a reduction region for reducing transmission of a sound energy emitted through an array speaker and a concentration region for concentrating transmission of the sound energy and also in consideration of a sound energy efficiency of the concentration region. Also, the SSE distribution control apparatus determines an array size of a speaker in a case where the sound energy ratio is maximized, according to frequency variation of the input signal.

07-05-2012

20140311499

HEADSET TO PROVIDE NOISE REDUCTION - A headset to provide noise reduction may include a first microphone that is disposed outside the headset and detects external noise, a first blocking unit configured to block the external noise entering an inside of the headset, a second blocking unit configured to block external noise which is not blocked by the first blocking unit, a second microphone configured to detect internal noise of the headset including noise which is not blocked by the first blocking unit and the second blocking unit, and a speaker configured to output canceling noise to cancel the internal noise detected by the second microphone, wherein the second blocking unit surrounds the second microphone and comprises a one-way sound transmitting passage.